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net/virtio: add link speed parameter

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Some applications like pktgen use link speed to calculate
transmission rate. It limits outcome traffic to hardcoded 10G.

This patch adds speed devarg which allows to configure
link speed of virtio device.

Signed-off-by: Ivan Dyukov <i.dyukov@samsung.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Ivan Dyukov 2020-03-30 10:57:59 +03:00 committed by Ferruh Yigit
parent 44d7b2e87b
commit 49119e3855
3 changed files with 90 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
doc/guides/nics/virtio.rst
View File

@ -356,6 +356,13 @@ Below devargs are supported by the PCI virtio driver:
a virtio device needs to work in vDPA mode.
(Default: 0 (disabled))
#. ``speed``:
It is used to specify link speed of virtio device. Link speed is a part of
link status structure. It could be requested by application using
rte_eth_link_get_nowait function.
(Default: 10000 (10G))
Below devargs are supported by the virtio-user vdev:
#. ``path``:

99
drivers/net/virtio/virtio_ethdev.c
View File

@ -45,6 +45,10 @@ static int virtio_dev_promiscuous_enable(struct rte_eth_dev *dev);
static int virtio_dev_promiscuous_disable(struct rte_eth_dev *dev);
static int virtio_dev_allmulticast_enable(struct rte_eth_dev *dev);
static int virtio_dev_allmulticast_disable(struct rte_eth_dev *dev);
static uint32_t virtio_dev_speed_capa_get(uint32_t speed);
static int virtio_dev_devargs_parse(struct rte_devargs *devargs,
int *vdpa,
uint32_t *speed);
static int virtio_dev_info_get(struct rte_eth_dev *dev,
struct rte_eth_dev_info *dev_info);
static int virtio_dev_link_update(struct rte_eth_dev *dev,
@ -1861,6 +1865,7 @@ int
eth_virtio_dev_init(struct rte_eth_dev *eth_dev)
{
struct virtio_hw *hw = eth_dev->data->dev_private;
uint32_t speed = ETH_SPEED_NUM_10G;
int ret;
if (sizeof(struct virtio_net_hdr_mrg_rxbuf) > RTE_PKTMBUF_HEADROOM) {
@ -1886,7 +1891,11 @@ eth_virtio_dev_init(struct rte_eth_dev *eth_dev)
return 0;
}
ret = virtio_dev_devargs_parse(eth_dev->device->devargs,
NULL, &speed);
if (ret < 0)
return ret;
hw->speed = speed;
/*
* Pass the information to the rte_eth_dev_close() that it should also
* release the private port resources.
@ -1956,6 +1965,7 @@ eth_virtio_dev_uninit(struct rte_eth_dev *eth_dev)
return 0;
}
static int vdpa_check_handler(__rte_unused const char *key,
const char *value, void *ret_val)
{
@ -1967,33 +1977,89 @@ static int vdpa_check_handler(__rte_unused const char *key,
return 0;
}
static uint32_t
virtio_dev_speed_capa_get(uint32_t speed)
{
switch (speed) {
case ETH_SPEED_NUM_10G:
return ETH_LINK_SPEED_10G;
case ETH_SPEED_NUM_20G:
return ETH_LINK_SPEED_20G;
case ETH_SPEED_NUM_25G:
return ETH_LINK_SPEED_25G;
case ETH_SPEED_NUM_40G:
return ETH_LINK_SPEED_40G;
case ETH_SPEED_NUM_50G:
return ETH_LINK_SPEED_50G;
case ETH_SPEED_NUM_56G:
return ETH_LINK_SPEED_56G;
case ETH_SPEED_NUM_100G:
return ETH_LINK_SPEED_100G;
default:
return 0;
}
}
#define VIRTIO_ARG_SPEED "speed"
#define VIRTIO_ARG_VDPA "vdpa"
static int
virtio_dev_devargs_parse(struct rte_devargs *devargs, int *vdpa)
link_speed_handler(const char *key __rte_unused,
const char *value, void *ret_val)
{
uint32_t val;
if (!value || !ret_val)
return -EINVAL;
val = strtoul(value, NULL, 0);
/* validate input */
if (virtio_dev_speed_capa_get(val) == 0)
return -EINVAL;
*(uint32_t *)ret_val = val;
return 0;
}
static int
virtio_dev_devargs_parse(struct rte_devargs *devargs, int *vdpa,
uint32_t *speed)
{
struct rte_kvargs *kvlist;
const char *key = "vdpa";
int ret = 0;
if (devargs == NULL)
return 0;
kvlist = rte_kvargs_parse(devargs->args, NULL);
if (kvlist == NULL)
if (kvlist == NULL) {
PMD_INIT_LOG(ERR, "error when parsing param");
return 0;
if (!rte_kvargs_count(kvlist, key))
goto exit;
if (vdpa) {
}
if (vdpa && rte_kvargs_count(kvlist, VIRTIO_ARG_VDPA) == 1) {
/* vdpa mode selected when there's a key-value pair:
* vdpa=1
*/
ret = rte_kvargs_process(kvlist, key,
ret = rte_kvargs_process(kvlist, VIRTIO_ARG_VDPA,
vdpa_check_handler, vdpa);
if (ret < 0)
if (ret < 0) {
PMD_INIT_LOG(ERR, "Failed to parse %s",
VIRTIO_ARG_VDPA);
goto exit;
}
}
if (speed && rte_kvargs_count(kvlist, VIRTIO_ARG_SPEED) == 1) {
ret = rte_kvargs_process(kvlist,
VIRTIO_ARG_SPEED,
link_speed_handler, speed);
if (ret < 0) {
PMD_INIT_LOG(ERR, "Failed to parse %s",
VIRTIO_ARG_SPEED);
goto exit;
}
}
exit:
rte_kvargs_free(kvlist);
@ -2006,7 +2072,7 @@ static int eth_virtio_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
int vdpa = 0;
int ret = 0;
ret = virtio_dev_devargs_parse(pci_dev->device.devargs, &vdpa);
ret = virtio_dev_devargs_parse(pci_dev->device.devargs, &vdpa, NULL);
if (ret < 0) {
PMD_INIT_LOG(ERR, "devargs parsing is failed");
return ret;
@ -2385,8 +2451,8 @@ virtio_dev_link_update(struct rte_eth_dev *dev, __rte_unused int wait_to_complet
memset(&link, 0, sizeof(link));
link.link_duplex = ETH_LINK_FULL_DUPLEX;
link.link_speed = ETH_SPEED_NUM_10G;
link.link_autoneg = ETH_LINK_FIXED;
link.link_speed = hw->speed;
link.link_autoneg = ETH_LINK_AUTONEG;
if (!hw->started) {
link.link_status = ETH_LINK_DOWN;
@ -2440,8 +2506,7 @@ virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
{
uint64_t tso_mask, host_features;
struct virtio_hw *hw = dev->data->dev_private;
dev_info->speed_capa = ETH_LINK_SPEED_10G; /* fake value */
dev_info->speed_capa = virtio_dev_speed_capa_get(hw->speed);
dev_info->max_rx_queues =
RTE_MIN(hw->max_queue_pairs, VIRTIO_MAX_RX_QUEUES);

1
drivers/net/virtio/virtio_pci.h
View File

@ -259,6 +259,7 @@ struct virtio_hw {
uint16_t port_id;
uint8_t mac_addr[RTE_ETHER_ADDR_LEN];
uint32_t notify_off_multiplier;
uint32_t speed; /* link speed in MB */
uint8_t *isr;
uint16_t *notify_base;
struct virtio_pci_common_cfg *common_cfg;